I. We have, then, first, the new commission. Philip might well wonder why he should be taken away from successful work in a populous city, and despatched to the lonely road to Gaza. But he obeyed at once. He knew not for what he was sent there, but that ignorance did not trouble or retard him. It should be enough for us to see the next step. 'We walk by faith, not by sight,' for we none of us know what comes of our actions, and we get light as we go. Do to-day's plain duty, and when to-morrow is to-day its duty will be plain too. The river on which we sail winds, and not till we round the nearest bend do we see the course beyond. So we are kept in the peaceful posture of dependent obedience, and need to hold our communications with God open, that we may be sure of His guidance. No doubt, as Philip trudged along till he reached the Gaza road, he would have many a thought as to what he was to find there, and, when he came at last to the solitary track, would look eagerly over the uninhabited land for an explanation of his strange and vague instructions. But an obedient heart is not long left perplexed, and he who looks for duty to disclose itself will see it in due time. II. So we have next the explanation of the errand. Luke's 'Behold!' suggests the sudden sight of the great man's cortege in the distance. No doubt, he travelled with a train of attendants, as became his dignity, and would be conspicuous from afar. Philip, of course, did not know who he was when he caught sight of him, but Luke tells his rank at once, in order to lay stress on it, as well as to bring out the significance of his occupation and subsequent conversion. Here was a full-blooded Gentile, an eunuch, a courtier, who had been drawn to Israel's God, and was studying Israel's prophets as he rode. Perhaps he had chosen that road to Egypt for its quietness. At any rate, his occupation revealed the bent of his mind. Philip felt that the mystery of his errand was solved now, and he recognised the impulse to break through conventional barriers and address the evidently dignified stranger, as the voice of God's Spirit, and not his own. How he was sure of that we do not know, but the distinction drawn between the former communication by an angel and this from the Spirit points to a clear difference in his experiences, and to careful discrimination in the narrator. The variation is not made at random. Philip did not mistake a buzzing in his ears from the heating of his own heart for a divine voice. We have here no hallucinations of an enthusiast, but plain fact.